This setup solves the problem for LAN users creating new files or folders, and for files created within the share at the server console -and I thought I'd got a solution.

However, I found that we STILL (sigh) have a permisisons problem,in that folders copied into the share from other server devices (for example a USB stick) acquire permissions of 755, and hence are editable/deletable only by the console user.

This despite the USB stick being FAT, and despite the inherit-group (2) attribute on the parent folder -which should in theory prevent this happening. But, it doesn't.

I guess one answer is to never copy files locally at the server console, only via the network. Not exactly convenient, though. What we need is a proper solution that works reliably, 100% of the time.

Sorry about long post, but it's an awkward issue to describe. Done a lot of research into this, and so far not found anyone who can describe a setup which will make collaborative file-sharing work properly, without glitches.